/* checks planet names */
/* 参数 */
#include <stdio.h>
#include <string.h>

#define NUM_PLANETS 9

int main(int argc, char *argv[])
{
    char *planets[] = {
        "Mercury","Venus","Earth",
        "Mars","Jupiter","Saturn",
        "Uranus","Neptune","Pluto"
    };

    int i,j;

    for(i = 1; i < argc; i++){
        for(j = 0; j < NUM_PLANETS; j++)
            if(strcmp(argv[i], planets[j]) == 0){
                printf("%s is planet %d\n", argv[i], j+1);
                break;
            }

        if(j == NUM_PLANETS)
            printf("%s is not a planet\n", argv[i]);
    }

    return 0;

}
